Machines
2018
,
6
, 38
14 of 22
As the Istat dataset features huge and complete time-series with which the neural network model
results best fit the predictive task; in Table
5
, there are the predicted and real values for the total crops of
L’Aquila province and real values are very near to the predicted ones, in fact for apples the difference is
less than 2% and for pears less than 4.5%, highlighting the goodness of using this technique on this type
of dataset.
Table 5.
Task 1: a comparison example between the real values and their neural network model
prediction for the apple and pear total crops for the Italian province of L’Aquila on the Istat dataset.
Method: NN
Apple
Pears
Italian Province
Real Value
Predicted Value
Real Value
Predicted Value
L’Aquila
45,900
45,000
3925
3750
3.2. Task 2—Comparison between Machine Learning Algorithms on Missing Data (CNR Dataset—Results)
For this task, the predictive errors depicted in Table
6
highlight that the polynomial model best fits
the LAI values prediction for the three considered cultures. This outcome can be explained considering the
nature of this scientific values, as well as the temporal discontinuity with which they have been gathered,
along with their small amount; for the polynomial model, there is a very large difference from the others,
highlighting the simplicity and the advantage of using this standard but also the performing technique.
The plot comparison between linear and polynomial predictive models on this scientific dataset
is in Figure
7
, where a polynomial interpolation (green plot) shows how the predictive model is able
to approximate the peculiar growing trend (blue plot), which can fit unknown incoming data very
well. The higher grade mathematical model is better than the others and this happens both if, for the
training, you give the data for a single year, either if you give data for three years.
Table 6.
Task 2: comparison on the prediction error for the cultures leaf area index (LAI) value
exploiting machine learning methods on the CNR scientific agrarian dataset.
Culture
Prediction Error
NN
LR
Polynomial
Artichokes
139.00%
101.63%
25.70%
Pear
1779.38%
81.80%
10.00%
Pacciamata Eggplant
933.10%
564.89%
6.26%
Machines
2018
,
6
,
x FOR PEER REVIEW
14 of 22
As the Istat dataset features huge and complete time-series with
which the neural network
model results
best fit the predictive task; in Table 5, there are the predicted and
real values for the
total crops of L’Aquila province and real values are very
near to the predicted ones, in fact
for apples
the difference is less than 2% and for pears less than 4.5%, highlighting
the goodness of using this
technique on this type of dataset.
Table 5.
Task 1: a comparison example between the real values and
their neural network model
prediction for the apple and pear total crops for the Italian province of L’Aquila on the Istat dataset.
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